docs(x/authz): update grant docs (#21677)

Author: ziscky

x/authz/README.md

@@ -84,7 +84,7 @@ https://github.com/cosmos/cosmos-sdk/blob/v0.47.0-rc1/x/bank/types/send_authoriz
 
 #### StakeAuthorization
 
-`StakeAuthorization` implements the `Authorization` interface for messages in the [staking module](https://docs.cosmos.network/main/build/modules/staking). It takes an `AuthorizationType` to specify whether you want to authorise delegating, undelegating or redelegating (i.e. these have to be authorised separately). It also takes a required `MaxTokens` that keeps track of a limit to the amount of tokens that can be delegated/undelegated/redelegated. If left empty, the amount is unlimited. Additionally, this Msg takes an `AllowList` or a `DenyList`, which allows you to select which validators you allow or deny grantees to stake with.
+`StakeAuthorization` implements the `Authorization` interface for messages in the [staking module](https://docs.cosmos.network/main/build/modules/staking). It takes an `AuthorizationType` to specify whether you want to authorise delegating, undelegating or redelegating (i.e. these have to be authorised separately). It also takes an optional `MaxTokens` that keeps track of a limit to the amount of tokens that can be delegated/undelegated/redelegated. If left empty, the amount is unlimited. Additionally, this Msg takes an `AllowList` or a `DenyList`, which allows you to select which validators you allow or deny grantees to stake with.
 
 ```protobuf reference
 https://github.com/cosmos/cosmos-sdk/blob/v0.47.0-rc1/proto/cosmos/staking/v1beta1/authz.proto#L11-L35
@@ -276,11 +276,28 @@ The `grant` command allows a granter to grant an authorization to a grantee.
 ```bash
 simd tx authz grant <grantee> <authorization_type="send"|"generic"|"delegate"|"unbond"|"redelegate"> --from <granter> [flags]
 ```
+-  The `send` authorization_type refers to the built-in `SendAuthorization` type. The custom flags available are `spend-limit` (required) and `allow-list` (optional) , documented [here](#SendAuthorization)
 
 Example:
 
 ```bash
-simd tx authz grant cosmos1.. send --spend-limit=100stake --from=cosmos1..
+    simd tx authz grant cosmos1.. send --spend-limit=100stake --allow-list=cosmos1...,cosmos2... --from=cosmos1..
+```
+- The `generic` authorization_type refers to the built-in `GenericAuthorization` type. The custom flag available is `msg-type` ( required) documented [here](#GenericAuthorization).
+
+> Note: `msg-type` is any valid Cosmos SDK `Msg` type url.
+
+Example:
+```bash
+    simd tx authz grant cosmos1.. generic --msg-type=/cosmos.bank.v1beta1.MsgSend --from=cosmos1..
+```
+- The `delegate`,`unbond`,`redelegate` authorization_types refer to the built-in `StakeAuthorization` type. The custom flags available are `spend-limit` (optional), `allowed-validators` (optional) and `deny-validators` (optional) documented  [here](#StakeAuthorization).
+> Note: `allowed-validators` and `deny-validators` cannot both be empty. `spend-limit` represents the `MaxTokens`
+
+Example:
+
+```bash
+simd tx authz grant cosmos1.. delegate --spend-limit=100stake --allowed-validators=cosmos...,cosmos... --deny-validators=cosmos... --from=cosmos1..
 ```
 
 ##### revoke